The petition brands the unfortunate challenge as part of a master plan by Liverpool owner John W. Henry to destabilise the Gunners:

In the past few days it has been well-known that Liverpool FC have been on a campaign to destroy Arsenal and we, the fans of Arsenal, believe Daniel Agger was instructed by Liverpool's owner John Henry to target Jack Wilshere during the match.

As far as conspiracy theories go, it's pretty elaborate. But assuming that Liverpool will hand over their top striker in Suarez for free, along with £4.5 million in compensation, then there's no reason to think that they won't also be happy with the proposals for Agger to serve a six-game ban.